Why did John Stuart Mill criticize Robert Browning’s Pauline?

John Stuart Mill criticized Robert Browning’s first published work, Pauline: A Fragment of a Confession (1833), because he condemned the poet’s tendency to expose and exploit his own personal emotions. Mill specifically characterized the poem as displaying an "intense and morbid self-consciousness".1

This critique had a significant impact on Browning’s career, as it reportedly influenced his decision to move away from confessional poetry and instead adopt a more objective approach in his future work, eventually leading him to master the dramatic monologue.21